Update signal config.yaml.j2 merging upstream changes (#3164)

* Update signal config.yaml.j2 merging upstream changes

* Add raw/endraw around displayname_template for mautrix-signal

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Co-authored-by: Slavi Pantaleev <slavi@devture.com>

roles/custom/matrix-bridge-mautrix-signal/templates/config.yaml.j2

@@ -101,7 +101,7 @@ bridge:
     # {{.UUID}} - The UUID of the Signal user.
     # {{.AboutEmoji}} - The emoji set by the user in their profile.
     # {% endraw %}
-    displayname_template: "{{ '{{.ProfileName}} (Signal)' }}"
+    displayname_template: {% raw %}'{{or .ProfileName .PhoneNumber "Unknown user"}}'{% endraw %}
     # Whether to explicitly set the avatar and room name for private chat portal rooms.
     # If set to `default`, this will be enabled in encrypted rooms and disabled in unencrypted rooms.
     # If set to `always`, all DM rooms will have explicit names and avatars set.